Sandal upper



FIG. 1 is a perspective view of the sandal upper embodying the new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right elevational view thereof;

FIG. 4 is a left elevational view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof.

FIGS. 1-6 show an outsole in broken lines. The outsole is shown for environmental purposes and does not form any part of the claimed design. 

The ornamental design for a sandal upper, as shown and described. 